Are the new ones bte or ric style? If Ric you could have an extra set of receivers (the speakers that go in the ears). The receivers are the most common point of failure, and you could swap those out yourself. But, some brands only allow UP in an encased mold, meaning your backup receivers would have to have their own molds, making the total backup receivers around $400-500. The plain receivers without encased molds would be around $100-200 /pair.